We have here biotic and abiotic factors. Biotic factors are those factors which are living or simply the animals, plants, and the decomposers or detritus feeders which include fungi and bacteria. The abiotic factors as what were cited by the two of the above are composed of non-living components. Biotic factors have interdependent relationship with one another. And the non-living components where they are exposed to affects them at the same time. Every biome has an exclusive type of organisms and abiotic components situated in this specific biome particularly.

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Biomes are defined by factors such as plant structures (such as trees, shrubs, and grasses), leaf types (such as broadleaf and needleleaf), plant spacing (forest, woodland, savanna), and climate. Unlike ecozones, biomes are not defined by genetic, taxonomic, or historical similarities. Biomes are often identified with particular patterns of ecological succession and climax vegetation (quasi-equilibrium state of the local ecosystem). An ecosystem has many biotopes and a biome is a major habitat type. A major habitat type, however, is a compromise, as it has an intrinsic inhomogeneity.